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mesa/docs/envvars.rst
Marcin Ślusarz 0c58ad3e32 docs: use envvar directive more 
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20638>
2023-01-11 11:56:05 +00:00

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Environment Variables
=====================
Normally, no environment variables need to be set. Most of the
environment variables used by Mesa/Gallium are for debugging purposes,
but they can sometimes be useful for debugging end-user issues.
LibGL environment variables
---------------------------
.. envvar:: LIBGL_DEBUG
If defined debug information will be printed to stderr. If set to
``verbose`` additional information will be printed.
.. envvar:: LIBGL_DRIVERS_PATH
colon-separated list of paths to search for DRI drivers
.. envvar:: LIBGL_ALWAYS_INDIRECT
if set to ``true``, forces an indirect rendering context/connection.
.. envvar:: LIBGL_ALWAYS_SOFTWARE
if set to ``true``, always use software rendering
.. envvar:: LIBGL_NO_DRAWARRAYS
if set to ``true``, do not use DrawArrays GLX protocol (for
debugging)
.. envvar:: LIBGL_DRI2_DISABLE
disable DRI2 if set to ``true``.
.. envvar:: LIBGL_DRI3_DISABLE
disable DRI3 if set to ``true``.
Core Mesa environment variables
-------------------------------
.. envvar:: MESA_NO_ASM
if set, disables all assembly language optimizations
.. envvar:: MESA_NO_MMX
if set, disables Intel MMX optimizations
.. envvar:: MESA_NO_3DNOW
if set, disables AMD 3DNow! optimizations
.. envvar:: MESA_NO_SSE
if set, disables Intel SSE optimizations
.. envvar:: MESA_NO_ERROR
if set to 1, error checking is disabled as per :ext:`GL_KHR_no_error`.
This will result in undefined behavior for invalid use of the API, but
can reduce CPU use for apps that are known to be error free.
.. envvar:: MESA_DEBUG
if set, error messages are printed to stderr. For example, if the
application generates a ``GL_INVALID_ENUM`` error, a corresponding
error message indicating where the error occurred, and possibly why,
will be printed to stderr. For release builds, :envvar:`MESA_DEBUG`
defaults to off (no debug output). :envvar:`MESA_DEBUG` accepts the
following comma-separated list of named flags, which adds extra
behavior to just set :envvar:`MESA_DEBUG` to ``1``:
``silent``
turn off debug messages. Only useful for debug builds.
``flush``
flush after each drawing command
``incomplete_tex``
extra debug messages when a texture is incomplete
``incomplete_fbo``
extra debug messages when a FBO is incomplete
``context``
create a debug context (see ``GLX_CONTEXT_DEBUG_BIT_ARB``) and
print error and performance messages to stderr (or
``MESA_LOG_FILE``).
.. envvar:: MESA_LOG_FILE
specifies a file name for logging all errors, warnings, etc., rather
than stderr
.. envvar:: MESA_EXTENSION_OVERRIDE
can be used to enable/disable extensions. A value such as
``GL_EXT_foo -GL_EXT_bar`` will enable the ``GL_EXT_foo`` extension
and disable the ``GL_EXT_bar`` extension. Note that this will override
extensions override configured using driconf.
.. envvar:: MESA_EXTENSION_MAX_YEAR
The ``GL_EXTENSIONS`` string returned by Mesa is sorted by extension
year. If this variable is set to year X, only extensions defined on
or before year X will be reported. This is to work-around a bug in
some games where the extension string is copied into a fixed-size
buffer without truncating. If the extension string is too long, the
buffer overrun can cause the game to crash. This is a work-around for
that.
.. envvar:: MESA_GL_VERSION_OVERRIDE
changes the value returned by ``glGetString(GL_VERSION)`` and
possibly the GL API type.
- The format should be ``MAJOR.MINOR[FC|COMPAT]``
- ``FC`` is an optional suffix that indicates a forward compatible
context. This is only valid for versions >= 3.0.
- ``COMPAT`` is an optional suffix that indicates a compatibility
context or :ext:`GL_ARB_compatibility` support. This is only valid
for versions >= 3.1.
- GL versions <= 3.0 are set to a compatibility (non-Core) profile
- GL versions = 3.1, depending on the driver, it may or may not have
the :ext:`GL_ARB_compatibility` extension enabled.
- GL versions >= 3.2 are set to a Core profile
- Examples:
``2.1``
select a compatibility (non-Core) profile with GL version 2.1.
``3.0``
select a compatibility (non-Core) profile with GL version 3.0.
``3.0FC``
select a Core+Forward Compatible profile with GL version 3.0.
``3.1``
select GL version 3.1 with :ext:`GL_ARB_compatibility` enabled
per the driver default.
``3.1FC``
select GL version 3.1 with forward compatibility and
:ext:`GL_ARB_compatibility` disabled.
``3.1COMPAT``
select GL version 3.1 with :ext:`GL_ARB_compatibility` enabled.
``X.Y``
override GL version to X.Y without changing the profile.
``X.YFC``
select a Core+Forward Compatible profile with GL version X.Y.
``X.YCOMPAT``
select a Compatibility profile with GL version X.Y.
- Mesa may not really implement all the features of the given
version. (for developers only)
.. envvar:: MESA_GLES_VERSION_OVERRIDE
changes the value returned by ``glGetString(GL_VERSION)`` for OpenGL
ES.
- The format should be ``MAJOR.MINOR``
- Examples: ``2.0``, ``3.0``, ``3.1``
- Mesa may not really implement all the features of the given
version. (for developers only)
.. envvar:: MESA_GLSL_VERSION_OVERRIDE
changes the value returned by
``glGetString(GL_SHADING_LANGUAGE_VERSION)``. Valid values are
integers, such as ``130``. Mesa will not really implement all the
features of the given language version if it's higher than what's
normally reported. (for developers only)
.. envvar:: MESA_SHADER_CACHE_DISABLE
if set to ``true``, disables the on-disk shader cache. If set to
``false``, enables the on-disk shader cache when it is disabled by
default.
.. envvar:: MESA_SHADER_CACHE_MAX_SIZE
if set, determines the maximum size of the on-disk cache of compiled
shader programs. Should be set to a number optionally followed by
``K``, ``M``, or ``G`` to specify a size in kilobytes, megabytes, or
gigabytes. By default, gigabytes will be assumed. And if unset, a
maximum size of 1GB will be used.
.. note::
A separate cache might be created for each architecture that Mesa is
installed for on your system. For example under the default settings
you may end up with a 1GB cache for x86_64 and another 1GB cache for
i386.
.. envvar:: MESA_SHADER_CACHE_DIR
if set, determines the directory to be used for the on-disk cache of
compiled shader programs. If this variable is not set, then the cache
will be stored in ``$XDG_CACHE_HOME/mesa_shader_cache`` (if that
variable is set), or else within ``.cache/mesa_shader_cache`` within
the user's home directory.
.. envvar:: MESA_SHADER_CACHE_SHOW_STATS
if set to ``true``, keeps hit/miss statistics for the shader cache.
These statistics are printed when the app terminates.
.. envvar:: MESA_DISK_CACHE_COMBINE_RW_WITH_RO_FOZ
if set to 1, enables simultaneous use of rw and ro fossilize db caches.
At first data will be retrieved from the read-only foz cache. If data
isn't found in the ro cache, then it will be retrieved from the rw cache.
.. envvar:: MESA_GLSL
:ref:`shading language compiler options <envvars>`
.. envvar:: MESA_NO_MINMAX_CACHE
when set, the minmax index cache is globally disabled.
.. envvar:: MESA_SHADER_CAPTURE_PATH
see :ref:`Capturing Shaders <capture>`
.. envvar:: MESA_SHADER_DUMP_PATH
see :ref:`Experimenting with Shader Replacements <replacement>`
.. envvar:: MESA_SHADER_READ_PATH
see :ref:`Experimenting with Shader Replacements <replacement>`
.. envvar:: MESA_VK_VERSION_OVERRIDE
changes the Vulkan physical device version as returned in
``VkPhysicalDeviceProperties::apiVersion``.
- The format should be ``MAJOR.MINOR[.PATCH]``
- This will not let you force a version higher than the driver's
instance version as advertised by ``vkEnumerateInstanceVersion``
- This can be very useful for debugging but some features may not be
implemented correctly. (For developers only)
.. envvar:: MESA_VK_WSI_PRESENT_MODE
overrides the WSI present mode clients specify in
``VkSwapchainCreateInfoKHR::presentMode``. Values can be ``fifo``,
``relaxed``, ``mailbox`` or ``immediate``.
.. envvar:: MESA_VK_ABORT_ON_DEVICE_LOSS
causes the Vulkan driver to call abort() immediately after detecting a
lost device. This is extremely useful when testing as it prevents the
test suite from continuing on with a lost device.
.. envvar:: MESA_VK_ENABLE_SUBMIT_THREAD
for Vulkan drivers which support real timeline semaphores, this forces
them to use a submit thread from the beginning, regardless of whether or
not they ever see a wait-before-signal condition.
.. envvar:: MESA_LOADER_DRIVER_OVERRIDE
chooses a different driver binary such as ``etnaviv`` or ``zink``.
.. envvar:: DRI_PRIME
the default GPU is the one used by Wayland/Xorg or the one connected to a
display. This variable allows to select a different GPU. It applies to OpenGL
and Vulkan (in this case "select" means the GPU will be first in the reported
physical devices list). The supported syntaxes are:
- ``DRI_PRIME=1``: selects the first non-default GPU.
- ``DRI_PRIME=pci-0000_02_00_0``: selects the GPU connected to this PCIe bus
- ``DRI_PRIME=vendor_id:device_id``: selects the first GPU matching these ids
.. note::
``lspci -nn | grep VGA`` can be used to know the PCIe bus or ids to use.
NIR passes environment variables
--------------------------------
The following are only applicable for drivers that uses NIR, as they
modify the behavior for the common ``NIR_PASS`` and ``NIR_PASS_V`` macros,
that wrap calls to NIR lowering/optimizations.
.. envvar:: NIR_DEBUG
a comma-separated list of debug options to apply to NIR
shaders. Use ``NIR_DEBUG=help`` to print a list of available options.
.. envvar:: NIR_SKIP
a comma-separated list of optimization/lowering passes to skip.
Mesa Xlib driver environment variables
--------------------------------------
The following are only applicable to the Mesa Xlib software driver. See
the :doc:`Xlib software driver page <xlibdriver>` for details.
.. envvar:: MESA_RGB_VISUAL
specifies the X visual and depth for RGB mode
.. envvar:: MESA_BACK_BUFFER
specifies how to implement the back color buffer, either ``pixmap``
or ``ximage``
.. envvar:: MESA_XSYNC
enable synchronous X behavior (for debugging only)
.. envvar:: MESA_GLX_FORCE_ALPHA
if set, forces RGB windows to have an alpha channel.
.. envvar:: MESA_GLX_DEPTH_BITS
specifies default number of bits for depth buffer.
.. envvar:: MESA_GLX_ALPHA_BITS
specifies default number of bits for alpha channel.
Mesa WGL driver environment variables
-------------------------------------
The following are only applicable to the Mesa WGL driver, which is in use
on Windows.
.. envvar:: WGL_FORCE_MSAA
if set to a positive value, specifies the number of MSAA samples to
force when choosing the display configuration.
.. envvar:: WGL_DISABLE_ERROR_DIALOGS
if set to 1, true or yes, disables Win32 error dialogs. Useful for
automated test-runs.
Intel driver environment variables
----------------------------------------------------
.. envvar:: INTEL_BLACKHOLE_DEFAULT
if set to 1, true or yes, then the OpenGL implementation will
default ``GL_BLACKHOLE_RENDER_INTEL`` to true, thus disabling any
rendering.
.. envvar:: INTEL_COMPUTE_CLASS
If set to 1, true or yes, then I915_ENGINE_CLASS_COMPUTE will be
supported. For OpenGL, iris will attempt to use a compute engine
for compute dispatches if one is detected. For Vulkan, anvil will
advertise support for a compute queue if a compute engine is
detected.
.. envvar:: INTEL_DEBUG
a comma-separated list of named flags, which do various things:
``ann``
annotate IR in assembly dumps
``bat``
emit batch information
``blit``
emit messages about blit operations
``blorp``
emit messages about the blorp operations (blits & clears)
``buf``
emit messages about buffer objects
``bt``
emit messages binding tables
``capture-all``
flag all buffers to be captured by the kernel driver when
generating an error stage after a GPU hang
``clip``
emit messages about the clip unit (for old gens, includes the CLIP
program)
``color``
use color in output
``cs``
dump shader assembly for compute shaders
``do32``
generate compute shader SIMD32 programs even if workgroup size
doesn't exceed the SIMD16 limit
``fall``
emit messages about performance issues (same as ``perf``)
``fs``
dump shader assembly for fragment shaders
``gs``
dump shader assembly for geometry shaders
``hex``
print instruction hex dump with the disassembly
``l3``
emit messages about the new L3 state during transitions
``mesh``
dump shader assembly for mesh shaders
``no8``
don't generate SIMD8 fragment shader
``no16``
suppress generation of 16-wide fragment shaders. useful for
debugging broken shaders
``no32``
suppress generation of 32-wide fragment shaders. useful for
debugging broken shaders
``no-oaconfig``
disable HW performance metric configuration, and anything
related to i915-perf (useful when running on simulation)
``nocompact``
disable instruction compaction
``nodualobj``
suppress generation of dual-object geometry shader code
``nofc``
disable fast clears
``noccs``
disable lossless color compression
``optimizer``
dump shader assembly to files at each optimization pass and
iteration that make progress
``pc``
emit messages about PIPE_CONTROL instruction usage
``perf``
emit messages about performance issues
``perfmon``
emit messages about :ext:`GL_AMD_performance_monitor`
``reemit``
mark all state dirty on each draw call
``rt``
dump shader assembly for ray tracing shaders
``sf``
emit messages about the strips & fans unit (for old gens, includes
the SF program)
``soft64``
enable implementation of software 64bit floating point support
``spill_fs``
force spilling of all registers in the scalar backend (useful to
debug spilling code)
``spill_vec4``
force spilling of all registers in the vec4 backend (useful to
debug spilling code)
``stall``
inserts a stall on the GPU after each draw/dispatch command to
wait for it to finish before starting any new work.
``submit``
emit batchbuffer usage statistics
``sync``
after sending each batch, wait on the CPU for that batch to
finish rendering
``task``
dump shader assembly for task shaders
``tcs``
dump shader assembly for tessellation control shaders
``tcs8``
force usage of 8-patches tessellation control shaders (only
for gfx 9-11)
``tes``
dump shader assembly for tessellation evaluation shaders
``tex``
emit messages about textures.
``urb``
emit messages about URB setup
``vs``
dump shader assembly for vertex shaders
``wm``
dump shader assembly for fragment shaders (same as ``fs``)
.. envvar:: INTEL_MEASURE
Collects GPU timestamps over common intervals, and generates a CSV report
to show how long rendering took. The overhead of collection is limited to
the flushing that is required at the interval boundaries for accurate
timestamps. By default, timing data is sent to ``stderr``. To direct output
to a file:
``INTEL_MEASURE=file=/tmp/measure.csv {workload}``
To begin capturing timestamps at a particular frame:
``INTEL_MEASURE=file=/tmp/measure.csv,start=15 {workload}``
To capture only 23 frames:
``INTEL_MEASURE=count=23 {workload}``
To capture frames 15-37, stopping before frame 38:
``INTEL_MEASURE=start=15,count=23 {workload}``
Designate an asynchronous control file with:
``INTEL_MEASURE=control=path/to/control.fifo {workload}``
As the workload runs, enable capture for 5 frames with:
``$ echo 5 > path/to/control.fifo``
Enable unbounded capture:
``$ echo -1 > path/to/control.fifo``
and disable with:
``$ echo 0 > path/to/control.fifo``
Select the boundaries of each snapshot with:
``INTEL_MEASURE=draw``
Collects timings for every render (DEFAULT)
``INTEL_MEASURE=rt``
Collects timings when the render target changes
``INTEL_MEASURE=batch``
Collects timings when batches are submitted
``INTEL_MEASURE=frame``
Collects timings at frame boundaries
With ``INTEL_MEASURE=interval=5``, the duration of 5 events will be
combined into a single record in the output. When possible, a single
start and end event will be submitted to the GPU to minimize
stalling. Combined events will not span batches, except in
the case of ``INTEL_MEASURE=frame``.
.. envvar:: INTEL_NO_HW
if set to 1, true or yes, prevents batches from being submitted to the
hardware. This is useful for debugging hangs, etc.
.. envvar:: INTEL_PRECISE_TRIG
if set to 1, true or yes, then the driver prefers accuracy over
performance in trig functions.
.. envvar:: INTEL_SHADER_ASM_READ_PATH
if set, determines the directory to be used for overriding shader
assembly. The binaries with custom assembly should be placed in
this folder and have a name formatted as ``sha1_of_assembly.bin``.
The SHA-1 of a shader assembly is printed when assembly is dumped via
corresponding :envvar:`INTEL_DEBUG` flag (e.g. ``vs`` for vertex shader).
A binary could be generated from a dumped assembly by ``i965_asm``.
For :envvar:`INTEL_SHADER_ASM_READ_PATH` to work it is necessary to enable
dumping of corresponding shader stages via :envvar:`INTEL_DEBUG`.
It is advised to use ``nocompact`` flag of :envvar:`INTEL_DEBUG` when
dumping and overriding shader assemblies.
The success of assembly override would be signified by "Successfully
overrode shader with sha1 <SHA-1>" in stderr replacing the original
assembly.
.. envvar:: INTEL_SIMD_DEBUG
a comma-separated list of named flags, which control simd dispatch widths:
``fs8``
allow generation of SIMD8 fragment shader
``fs16``
allow generation of SIMD16 fragment shader
``fs32``
allow generation of SIMD32 fragment shader
``cs8``
allow generation of SIMD8 compute shader
``cs16``
allow generation of SIMD16 compute shader
``cs32``
allow generation of SIMD32 compute shader
``ts8``
allow generation of SIMD8 task shader
``ts16``
allow generation of SIMD16 task shader
``ts32``
allow generation of SIMD32 task shader
``ms8``
allow generation of SIMD8 mesh shader
``ms16``
allow generation of SIMD16 mesh shader
``ms32``
allow generation of SIMD32 mesh shader
``rt8``
allow generation of SIMD8 ray-tracing shader
``rt16``
allow generation of SIMD16 ray-tracing shader
``rt32``
allow generation of SIMD32 ray-tracing shader
If none of widths for particular shader stage was specified, then all
widths are allowed.
DRI environment variables
-------------------------
.. envvar:: DRI_NO_MSAA
disable MSAA for GLX/EGL MSAA visuals
Vulkan mesa device select layer environment variables
-----------------------------------------------------
.. envvar:: MESA_VK_DEVICE_SELECT
when set to "list" prints the list of devices.
when set to "vid:did" number from PCI device. That PCI device is
selected as default. The default device is returned as the first
device in vkEnumeratePhysicalDevices API.
.. envvar:: MESA_VK_DEVICE_SELECT_FORCE_DEFAULT_DEVICE
when set to 1, the device identified as default will be the only
one returned in vkEnumeratePhysicalDevices API.
EGL environment variables
-------------------------
Mesa EGL supports different sets of environment variables. See the
:doc:`Mesa EGL <egl>` page for the details.
Gallium environment variables
-----------------------------
.. envvar:: GALLIUM_HUD
draws various information on the screen, like framerate, CPU load,
driver statistics, performance counters, etc. Set
:envvar:`GALLIUM_HUD` to ``help`` and run e.g. ``glxgears`` for more info.
.. envvar:: GALLIUM_HUD_PERIOD
sets the HUD update rate in seconds (float). Use zero to update every
frame. The default period is 1/2 second.
.. envvar:: GALLIUM_HUD_VISIBLE
control default visibility, defaults to true.
.. envvar:: GALLIUM_HUD_TOGGLE_SIGNAL
toggle visibility via user specified signal. Especially useful to
toggle HUD at specific points of application and disable for
unencumbered viewing the rest of the time. For example, set
:envvar:`GALLIUM_HUD_VISIBLE` to ``false`` and
:envvar:`GALLIUM_HUD_TOGGLE_SIGNAL` to ``10`` (``SIGUSR1``). Use
``kill -10 <pid>`` to toggle the HUD as desired.
.. envvar:: GALLIUM_HUD_SCALE
Scale HUD by an integer factor, for high DPI displays. Default is 1.
.. envvar:: GALLIUM_HUD_ROTATION
Rotate the HUD by an integer number of degrees, the specified value must be
a multiple of 90. Default is 0.
.. envvar:: GALLIUM_HUD_DUMP_DIR
specifies a directory for writing the displayed HUD values into
files.
.. envvar:: GALLIUM_DRIVER
useful in combination with :envvar:`LIBGL_ALWAYS_SOFTWARE` = ``true`` for
choosing one of the software renderers ``softpipe`` or ``llvmpipe``.
.. envvar:: GALLIUM_LOG_FILE
specifies a file for logging all errors, warnings, etc. rather than
stderr.
.. envvar:: GALLIUM_PIPE_SEARCH_DIR
specifies an alternate search directory for pipe-loader which overrides
the compile-time path based on the install location.
.. envvar:: GALLIUM_PRINT_OPTIONS
if non-zero, print all the Gallium environment variables which are
used, and their current values.
.. envvar:: GALLIUM_TRACE
If set, this variable will cause the :ref:`trace` output to be written to the
specified file. Paths may be relative or absolute; relative paths are relative
to the working directory. For example, setting it to "trace.xml" will cause
the trace to be written to a file of the same name in the working directory.
.. envvar:: GALLIUM_TRACE_TC
If enabled while :ref:`trace` is active, this variable specifies that the threaded context
should be traced for drivers which implement it. By default, the driver thread is traced,
which will include any reordering of the command stream from threaded context.
.. envvar:: GALLIUM_TRACE_TRIGGER
If set while :ref:`trace` is active, this variable specifies a filename to monitor.
Once the file exists (e.g., from the user running 'touch /path/to/file'), a single
frame will be recorded into the trace output.
Paths may be relative or absolute; relative paths are relative to the working directory.
.. envvar:: GALLIUM_DUMP_CPU
if non-zero, print information about the CPU on start-up
.. envvar:: TGSI_PRINT_SANITY
if set, do extra sanity checking on TGSI shaders and print any errors
to stderr.
.. envvar:: DRAW_FSE
Enable fetch-shade-emit middle-end even though its not correct (e.g.
for Softpipe)
.. envvar:: DRAW_NO_FSE
Disable fetch-shade-emit middle-end even when it is correct
.. envvar:: DRAW_USE_LLVM
if set to zero, the draw module will not use LLVM to execute shaders,
vertex fetch, etc.
.. envvar:: ST_DEBUG
controls debug output from the Mesa/Gallium state tracker. Setting to
``tgsi``, for example, will print all the TGSI shaders. See
:file:`src/mesa/state_tracker/st_debug.c` for other options.
.. envvar:: GALLIUM_OVERRIDE_CPU_CAPS
Override CPU capabilities for LLVMpipe and Softpipe, possible values for x86:
``nosse``
``sse``
``sse2``
``sse3``
``ssse3``
``sse4.1``
``avx``
Clover environment variables
----------------------------
.. envvar:: CLOVER_EXTRA_BUILD_OPTIONS
allows specifying additional compiler and linker options. Specified
options are appended after the options set by the OpenCL program in
``clBuildProgram``.
.. envvar:: CLOVER_EXTRA_COMPILE_OPTIONS
allows specifying additional compiler options. Specified options are
appended after the options set by the OpenCL program in
``clCompileProgram``.
.. envvar:: CLOVER_EXTRA_LINK_OPTIONS
allows specifying additional linker options. Specified options are
appended after the options set by the OpenCL program in
``clLinkProgram``.
Rusticl environment variables
-----------------------------
.. envvar:: RUSTICL_DEVICE_TYPE
allows to overwrite the device type of devices. Possible values are
``accelerator``, ``cpu``, ``custom`` and ``gpu``
.. envvar:: RUSTICL_CL_VERSION
overwrites the auto detected OpenCL version of all devices. Specified as
``major.minor``.
.. envvar:: RUSTICL_ENABLE
a comma-separated list of drivers to enable CL on. An optional list of
comma-separated integers can be passed per driver to specify which devices
to enable. Examples:
- ``RUSTICL_ENABLE=iris`` (enables all iris devices)
- ``RUSTICL_ENABLE=iris:1,radeonsi:0,2`` (enables second iris and first
and third radeonsi device)
Nine frontend environment variables
-----------------------------------
.. envvar:: D3D_ALWAYS_SOFTWARE
an integer, which forces Nine to use the CPU instead of GPU acceleration.
.. envvar:: NINE_DEBUG
a comma-separated list of named flags that do debugging things.
Use ``NINE_DEBUG=help`` to print a list of available options.
.. envvar:: NINE_FF_DUMP
a boolean, which dumps shaders generated by a fixed function (FF).
.. envvar:: NINE_SHADER
a comma-separated list of named flags, which do alternate shader handling.
Use ``NINE_SHADER=help`` to print a list of available options.
.. envvar:: NINE_QUIRKS
a comma-separated list of named flags that do various things.
Use ``NINE_DEBUG=help`` to print a list of available options.
Softpipe driver environment variables
-------------------------------------
.. envvar:: SOFTPIPE_DEBUG
a comma-separated list of named flags, which do various things:
``vs``
Dump vertex shader assembly to stderr
``fs``
Dump fragment shader assembly to stderr
``gs``
Dump geometry shader assembly to stderr
``cs``
Dump compute shader assembly to stderr
``no_rast``
rasterization is disabled. For profiling purposes.
``use_llvm``
the Softpipe driver will try to use LLVM JIT for vertex
shading processing.
``use_tgsi``
if set, the Softpipe driver will ask to directly consume TGSI, instead
of NIR.
LLVMpipe driver environment variables
-------------------------------------
.. envvar:: LP_NO_RAST
if set LLVMpipe will no-op rasterization
.. envvar:: LP_DEBUG
a comma-separated list of debug options is accepted. See the source
code for details.
.. envvar:: LP_PERF
a comma-separated list of options to selectively no-op various parts
of the driver. See the source code for details.
.. envvar:: LP_NUM_THREADS
an integer indicating how many threads to use for rendering. Zero
turns off threading completely. The default value is the number of
CPU cores present.
VMware SVGA driver environment variables
----------------------------------------
.. envvar:: SVGA_FORCE_SWTNL
force use of software vertex transformation
.. envvar:: SVGA_NO_SWTNL
don't allow software vertex transformation fallbacks (will often
result in incorrect rendering).
.. envvar:: SVGA_DEBUG
for dumping shaders, constant buffers, etc. See the code for details.
.. envvar:: SVGA_EXTRA_LOGGING
if set, enables extra logging to the ``vmware.log`` file, such as the
OpenGL program's name and command line arguments.
.. envvar:: SVGA_NO_LOGGING
if set, disables logging to the ``vmware.log`` file. This is useful
when using Valgrind because it otherwise crashes when initializing
the host log feature.
See the driver code for other, lesser-used variables.
WGL environment variables
-------------------------
.. envvar:: WGL_SWAP_INTERVAL
to set a swap interval, equivalent to calling
``wglSwapIntervalEXT()`` in an application. If this environment
variable is set, application calls to ``wglSwapIntervalEXT()`` will
have no effect.
VA-API environment variables
----------------------------
.. envvar:: VAAPI_MPEG4_ENABLED
enable MPEG4 for VA-API, disabled by default.
VC4 driver environment variables
--------------------------------
.. envvar:: VC4_DEBUG
a comma-separated list of named flags, which do various things. Use
``VC4_DEBUG=help`` to print a list of available options.
Shared Vulkan driver environment variables
------------------------------------------
.. envvar:: MESA_VK_MEMORY_TRACE
enable memory tracing and exporting RMV captures (requires the
``scripts/setup.sh`` script in the Radeon Developer Tools folder to be
run beforehand). ``MESA_VK_MEMORY_TRACE=n`` dumps data
after n frames. Currently, only RADV implements this.
.. envvar:: MESA_VK_MEMORY_TRACE_TRIGGER
enable trigger file-based memory tracing. (e.g.
``export MESA_VK_MEMORY_TRACE_TRIGGER=/tmp/memory_trigger`` and then
``touch /tmp/memory_trigger`` to capture a memory trace).
Running ``scripts/setup.sh`` beforehand is required.
V3D/V3DV driver environment variables
-------------------------------------
.. envvar:: V3D_DEBUG
a comma-separated list of debug options. Use ``V3D_DEBUG=help`` to
print a list of available options.
.. _radv env-vars:
RADV driver environment variables
---------------------------------
.. envvar:: RADV_DEBUG
a comma-separated list of named flags, which do various things:
``llvm``
enable LLVM compiler backend
``allbos``
force all allocated buffers to be referenced in submissions
``checkir``
validate the LLVM IR before LLVM compiles the shader
``epilogs``
dump fragment shader epilogs
``forcecompress``
Enables DCC,FMASK,CMASK,HTILE in situations where the driver supports it
but normally does not deem it beneficial.
``hang``
enable GPU hangs detection and dump a report to
$HOME/radv_dumps_<pid>_<time> if a GPU hang is detected
``img``
Print image info
``info``
show GPU-related information
``invariantgeom``
Mark geometry-affecting outputs as invariant. This works around a common
class of application bugs appearing as flickering.
``metashaders``
dump internal meta shaders
``noatocdithering``
disable dithering for alpha to coverage
``nobinning``
disable primitive binning
``nocache``
disable shaders cache
``nocompute``
disable compute queue
``nodcc``
disable Delta Color Compression (DCC) on images
``nodisplaydcc``
disable Delta Color Compression (DCC) on displayable images
``nodynamicbounds``
do not check OOB access for dynamic descriptors
``nofastclears``
disable fast color/depthstencil clears
``nofmask``
disable FMASK compression on MSAA images (GFX6-GFX10.3)
``nohiz``
disable HIZ for depthstencil images
``noibs``
disable directly recording command buffers in GPU-visible memory
``nomemorycache``
disable memory shaders cache
``nongg``
disable NGG for GFX10 and GFX10.3
``nonggc``
disable NGG culling on GPUs where it's enabled by default (GFX10.3+ only).
``notccompatcmask``
disable TC-compat CMASK for MSAA surfaces
``noumr``
disable UMR dumps during GPU hang detection (only with
:envvar:`RADV_DEBUG` = ``hang``)
``novrsflatshading``
disable VRS for flat shading (only on GFX10.3+)
``preoptir``
dump LLVM IR before any optimizations
``prologs``
dump vertex shader prologs
``shaders``
dump shaders
``shaderstats``
dump shader statistics
``spirv``
dump SPIR-V
``splitfma``
split application-provided fused multiply-add in geometry stages
``startup``
display info at startup
``syncshaders``
synchronize shaders after all draws/dispatches
``vmfaults``
check for VM memory faults via dmesg
``zerovram``
initialize all memory allocated in VRAM as zero
.. envvar:: RADV_FORCE_FAMILY
create a null device to compile shaders without a AMD GPU (e.g. VEGA10)
.. envvar:: RADV_FORCE_VRS
allow to force per-pipeline vertex VRS rates on GFX10.3+. This is only
forced for pipelines that don't explicitly use VRS or flat shading.
The supported values are 2x2, 1x2, 2x1 and 1x1. Only for testing purposes.
.. envvar:: RADV_FORCE_VRS_CONFIG_FILE
similar to ``RADV_FORCE_VRS`` but allow to configure from a file. If present,
this supersedes ``RADV_FORCE_VRS``.
.. envvar:: RADV_PERFTEST
a comma-separated list of named flags, which do various things:
``bolist``
enable the global BO list
``cswave32``
enable wave32 for compute shaders (GFX10+)
``dccmsaa``
enable DCC for MSAA images
``emulate_rt``
forces ray-tracing to be emulated in software on GFX10_3+ and enables
rt extensions with older hardware.
``gewave32``
enable wave32 for vertex/tess/geometry shaders (GFX10+)
``gpl``
enable experimental (and suboptimal) graphics pipeline library (still
under active development)
``localbos``
enable local BOs
``nosam``
disable optimizations that get enabled when all VRAM is CPU visible.
``nv_ms``
enable unofficial experimental support for :ext:`VK_NV_mesh_shader`.
``pswave32``
enable wave32 for pixel shaders (GFX10+)
``ngg_streamout``
enable NGG streamout
``nggc``
enable NGG culling on GPUs where it's not enabled by default (GFX10.1 only).
``rt``
enable rt pipelines whose implementation is still experimental.
``sam``
enable optimizations to move more driver internal objects to VRAM.
``rtwave64``
enable wave64 for ray tracing shaders (GFX10+)
.. envvar:: RADV_TEX_ANISO
force anisotropy filter (up to 16)
.. envvar:: RADV_THREAD_TRACE
enable frame based SQTT/RGP captures (e.g. ``export RADV_THREAD_TRACE=100``
will capture the frame #100)
.. envvar:: RADV_THREAD_TRACE_BUFFER_SIZE
set the SQTT/RGP buffer size in bytes (default value is 32MiB, the buffer is
automatically resized if too small)
.. envvar:: RADV_THREAD_TRACE_CACHE_COUNTERS
enable/disable SQTT/RGP cache counters on GFX10+ (disabled by default)
.. envvar:: RADV_THREAD_TRACE_INSTRUCTION_TIMING
enable/disable SQTT/RGP instruction timing (enabled by default)
.. envvar:: RADV_THREAD_TRACE_TRIGGER
enable trigger file based SQTT/RGP captures (e.g.
``export RADV_THREAD_TRACE_TRIGGER=/tmp/radv_sqtt_trigger`` and then
``touch /tmp/radv_sqtt_trigger`` to capture a frame)
.. envvar:: RADV_RRA_TRACE
enable frame based Radeon Raytracing Analyzer captures
(e.g. ``export RADV_RRA_TRACE=100`` will capture the frame #100)
.. envvar:: RADV_RRA_TRACE_TRIGGER
enable trigger file based RRA captures (e.g.
``export RADV_RRA_TRACE_TRIGGER=/tmp/radv_rra_trigger`` and then
``touch /tmp/radv_rra_trigger`` to capture a frame)
.. envvar:: RADV_RRA_TRACE_VALIDATE
enable validation of captured acceleration structures. Can be
useful if RRA crashes upon opening a trace.
.. envvar:: ACO_DEBUG
a comma-separated list of named flags, which do various things:
``validateir``
validate the ACO IR at various points of compilation (enabled by
default for debug/debugoptimized builds)
``novalidateir``
disable ACO IR validation in debug/debugoptimized builds
``validatera``
validate register assignment of ACO IR and catches many RA bugs
``perfwarn``
abort on some suboptimal code generation
``force-waitcnt``
force emitting waitcnt states if there is something to wait for
``novn``
disable value numbering
``noopt``
disable various optimizations
``noscheduling``
disable instructions scheduling
``perfinfo``
print information used to calculate some pipeline statistics
``liveinfo``
print liveness and register demand information before scheduling
RadeonSI driver environment variables
-------------------------------------
.. envvar:: radeonsi_no_infinite_interp
Kill PS with infinite interp coeff (might fix hangs)
.. envvar:: radeonsi_clamp_div_by_zero
Clamp div by zero (x / 0 becomes FLT_MAX instead of NaN) (might fix rendering corruptions)
.. envvar:: radeonsi_zerovram
Clear all allocated memory to 0 before usage (might fix rendering corruptions)
.. envvar:: AMD_DEBUG
a comma-separated list of named flags, which do various things:
``nodcc``
Disable DCC.
``nodccclear``
Disable DCC fast clear
``nodisplaydcc``
disable Delta Color Compression (DCC) on displayable images
``nodccmsaa``
Disable DCC for MSAA
``nodpbb``
Disable DPBB.
``nodfsm``
Disable DFSM.
``notiling``
Disable tiling
``nofmask``
Disable MSAA compression
``nohyperz``
Disable Hyper-Z
``no2d``
Disable 2D tiling
``info``
Print driver information
``tex``
Print texture info
``compute``
Print compute info
``vm``
Print virtual addresses when creating resources
``vs``
Print vertex shaders
``ps``
Print pixel shaders
``gs``
Print geometry shaders
``tcs``
Print tessellation control shaders
``tes``
Print tessellation evaluation shaders
``cs``
Print compute shaders
``noir``
Don't print the LLVM IR
``nonir``
Don't print NIR when printing shaders
``noasm``
Don't print disassembled shaders
``preoptir``
Print the LLVM IR before initial optimizations
``w32ge``
Use Wave32 for vertex, tessellation, and geometry shaders.
``w32ps``
Use Wave32 for pixel shaders.
``w32cs``
Use Wave32 for computes shaders.
``w64ge``
Use Wave64 for vertex, tessellation, and geometry shaders.
``w64ps``
Use Wave64 for pixel shaders.
``w64cs``
Use Wave64 for computes shaders.
``checkir``
Enable additional sanity checks on shader IR
``mono``
Use old-style monolithic shaders compiled on demand
``nooptvariant``
Disable compiling optimized shader variants.
``nowc``
Disable GTT write combining
``check_vm``
Check VM faults and dump debug info.
``reserve_vmid``
Force VMID reservation per context.
``nogfx``
Disable graphics. Only multimedia compute paths can be used.
``nongg``
Disable NGG and use the legacy pipeline.
``nggc``
Always use NGG culling even when it can hurt.
``nonggc``
Disable NGG culling.
``switch_on_eop``
Program WD/IA to switch on end-of-packet.
``nooutoforder``
Disable out-of-order rasterization
``dpbb``
Enable DPBB.
``dfsm``
Enable DFSM.
r600 driver environment variables
---------------------------------
.. envvar:: R600_DEBUG
a comma-separated list of named flags, which do various things:
``nocpdma``
Disable CP DMA
``nosb``
Disable sb backend for graphics shaders
``sbcl``
Enable sb backend for compute shaders
``sbdry``
Don't use optimized bytecode (just print the dumps)
``sbstat``
Print optimization statistics for shaders
``sbdump``
Print IR dumps after some optimization passes
``sbnofallback``
Abort on errors instead of fallback
``sbdisasm``
Use sb disassembler for shader dumps
``sbsafemath``
Disable unsafe math optimizations
``nirsb``
Enable NIR with SB optimizer
``tex``
Print texture info
``nir``
Enable experimental NIR shaders
``compute``
Print compute info
``vm``
Print virtual addresses when creating resources
``info``
Print driver information
``fs``
Print fetch shaders
``vs``
Print vertex shaders
``gs``
Print geometry shaders
``ps``
Print pixel shaders
``cs``
Print compute shaders
``tcs``
Print tessellation control shaders
``tes``
Print tessellation evaluation shaders
``noir``
Don't print the LLVM IR
``notgsi``
Don't print the TGSI
``noasm``
Don't print disassembled shaders
``preoptir``
Print the LLVM IR before initial optimizations
``checkir``
Enable additional sanity checks on shader IR
``nooptvariant``
Disable compiling optimized shader variants.
``testdma``
Invoke SDMA tests and exit.
``testvmfaultcp``
Invoke a CP VM fault test and exit.
``testvmfaultsdma``
Invoke a SDMA VM fault test and exit.
``testvmfaultshader``
Invoke a shader VM fault test and exit.
``nodma``
Disable asynchronous DMA
``nohyperz``
Disable Hyper-Z
``noinvalrange``
Disable handling of INVALIDATE_RANGE map flags
``no2d``
Disable 2D tiling
``notiling``
Disable tiling
``switch_on_eop``
Program WD/IA to switch on end-of-packet.
``forcedma``
Use asynchronous DMA for all operations when possible.
``precompile``
Compile one shader variant at shader creation.
``nowc``
Disable GTT write combining
``check_vm``
Check VM faults and dump debug info.
``unsafemath``
Enable unsafe math shader optimizations
.. envvar:: R600_DEBUG_COMPUTE
if set to ``true``, various compute-related debug information will
be printed to stderr. Defaults to ``false``.
.. envvar:: R600_DUMP_SHADERS
if set to ``true``, NIR shaders will be printed to stderr. Defaults
to ``false``.
.. envvar:: R600_HYPERZ
If set to ``false``, disables HyperZ optimizations. Defaults to ``true``.
.. envvar:: R600_NIR_DEBUG
a comma-separated list of named flags, which do various things:
``instr``
Log all consumed nir instructions
``ir``
Log created R600 IR
``cc``
Log R600 IR to assembly code creation
``noerr``
Don't log shader conversion errors
``si``
Log shader info (non-zero values)
``reg``
Log register allocation and lookup
``io``
Log shader in and output
``ass``
Log IR to assembly conversion
``flow``
Log control flow instructions
``merge``
Log register merge operations
``nomerge``
Skip register merge step
``tex``
Log texture ops
``trans``
Log generic translation messages
r300 driver environment variables
---------------------------------
.. envvar:: RADEON_DEBUG
a comma-separated list of named flags, which do various things:
``info``
Print hardware info (printed by default on debug builds
``fp``
Log fragment program compilation
``vp``
Log vertex program compilation
``draw``
Log draw calls
``swtcl``
Log SWTCL-specific info
``rsblock``
Log rasterizer registers
``psc``
Log vertex stream registers
``tex``
Log basic info about textures
``texalloc``
Log texture mipmap tree info
``rs``
Log rasterizer
``fb``
Log framebuffer
``cbzb``
Log fast color clear info
``hyperz``
Log HyperZ info
``scissor``
Log scissor info
``msaa``
Log MSAA resources
``anisohq``
Use high quality anisotropic filtering
``notiling``
Disable tiling
``noimmd``
Disable immediate mode
``noopt``
Disable shader optimizations
``nocbzb``
Disable fast color clear
``nozmask``
Disable zbuffer compression
``nohiz``
Disable hierarchical zbuffer
``nocmask``
Disable AA compression and fast AA clear
``use_tgsi``
Request TGSI shaders from the state tracker
``notcl``
Disable hardware accelerated Transform/Clip/Lighting
Asahi driver environment variables
----------------------------------
.. envvar:: ASAHI_MESA_DEBUG
a comma-separated list of named flags, which do various things:
``trace``
Trace work submitted to the GPU to files, using the agxdecode
infrastructure. This produces a large volume of data, so should be used
with caution. The traces are written to ``agxdecode.dump``,
but this can be overridden using ``AGXDECODE_DUMP_FILE``.
``no16``
Disable 16-bit floating point support. This may workaround application
bugs in certain OpenGL ES applications originally written for desktops. If
such applications are found in the wild, they should be fixed upstream (if
possible) or added in the Mesa-wide driconf (if closed source).
``dirty``
In debug builds only: disable dirty tracking optimizations.
.. envvar:: AGX_MESA_DEBUG
a comma-separated list of named flags, which do various things:
``shaders``
Print shaders being compiled at various stages in the pipeline.
``shaderdb``
Print statistics about compiled shaders.
``verbose``
Disassemble in verbose mode, including additional information that may be
useful for debugging.
``internal``
Include even internal shaders (as produced for clears, blits, and such)
when printing shaders. Without this flag, internal shaders are ignored by
the shaders and shaderdb flags.
``novalidate``
In debug builds only: skip internal intermediate representation validation.
``noopt``
Disable various backend optimizations.
.. _imagination env-vars:
PowerVR driver environment variables
------------------------------------------------
.. envvar:: PVR_DEBUG
A comma-separated list of debug options. Use `PVR_DEBUG=help` to
print a list of available options.
Other Gallium drivers have their own environment variables. These may
change frequently so the source code should be consulted for details.
i915 driver environment variables
---------------------------------
.. envvar:: I915_DEBUG
Debug flags for the i915 driver.
.. envvar:: I915_NO_HW
Stop the i915 driver from submitting commands to the hardware.
.. envvar:: I915_DUMP_CMD
Dump all commands going to the hardware.
Freedreno driver environment variables
--------------------------------------
.. envvar:: FD_MESA_DEBUG
Debug flags for the Freedreno driver.
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